Passing Values Between Pages Working with SESSION

Hello, Team. I am stuck here at the finish-line on this program, I am trying to create a Click event handler for the Confirm button to save the “txtSales”, “lblDiscountAmount”, and “lblTotalPrice” in session state. Once the Confirm button is clicked it will take the user to the Confirmation page (page 2) where it will display what was inputted by the user on the first page.

Here is what I have on the Default.aspx page (just a snippet of the form)

I have read my book and have done a lot of research online. I have even watched a couple YouTube videos. The problem is that it is still not working. I enjoy learning new languages and this is one of them. Yes, I am new to this but I should still have the logic down. Any help, someone, please.